You need to first get your sleeping pattern sorted. At the moment my sleeping pattern isn't great and I can tell it's reflecting on my day massively, so get that sorted. The best way to do that is do 'sleep hygiene' do not sleep for a full 24 hours and by nightfall you will be tired, so pick a time you would like to normally sleep and get to sleep at that time.
Also, make sure your diet is good. Make sure you're eating enough and also the right types of food.
Work out-trust me this works wonders. If you're mentally stable you will no doubt be physically stable also.
This dua comes to mind...
Allahumma inni a’oodhoo bika minal-hammi-walhazan. Wa’a oodhoo bika minal-ghammi-wal-kasal. Wa’a oodhoo bika minal jubni wal bukhl. Wa’a oodhoo bikal min ghalabatid-dayni-waqarir rijal.
Oh Allah, I seek refuge in You from worry and grief, from helplessness and laziness, from cowardice and stinginess, and from overpowering of debt and from oppression of men.
“Verily, with every difficulty there is relief.”
(The Holy Qur’an-94:6)
WaAllahu Ta'laa Alam.